Skype calls don't work in opera. What should I do?

Recently I started using web skype since it has less awful glitches than the desktop version (sick).

But web skype has a crucial disadvantage - while chats work fine, the calls don't work in every browser. Currently, firefox 32-bit versions works best (64 bit browsers aren't supported by skype). But I want the calls to work in my favorite Opera. Installing the web-skype browser plugin doesn't do the trick. What should I do?